Growing demand for sustainable,high-performance materials is driving research to replace petroleumbased plastics with abundant biomass,especially cellulose.However,the effective modification and functionalization of c...Growing demand for sustainable,high-performance materials is driving research to replace petroleumbased plastics with abundant biomass,especially cellulose.However,the effective modification and functionalization of cellulose is often impeded by complex processing requirements and limited performance tunability.Here,an innovative“active”green medium strategy based on an ethyl cellulose/thymol eutectic system is reported,enabling in situ chemical modification of eutectic components and the construction of dynamic self-adaptive networks without external catalysts or initiators.Through precise molecular design,dynamic boroxine networks and acrylate crosslinking networks are synergistically integrated into the cellulosic bioplastic(CBP)matrix.The resulting CBP-A2B8 exhibits exceptional optical transparency(~85%),superior mechanical properties(tensile strength~30 MPa),facile thermal processability,and closed-loop recyclability.Its chemical structure and mechanical performance remain highly stable even after 20 hot-compression recycling cycles.Complete biodegradation occurs under natural environmental conditions within approximately 100 days.Furthermore,the bioplastic,when combined with silver nanowires,forms high-performance flexible transparent conductive films successfully applied in customizable electroluminescent devices.Post-lifecycle,device components(silver nanowires and CBP matrix)are efficiently separated and recycled using a straightforward solvent-based method.This eutectic system-mediated strategy offers a novel pathway for the development of sustainable,high-performance bioplastics with a closed-loop lifecycle.展开更多
To address the issue of residual pollution caused by polyethylene mulch,this study explored the effects of different mulching methods on the soil environment of the yam field,as well as on yam yield and quality.The ex...To address the issue of residual pollution caused by polyethylene mulch,this study explored the effects of different mulching methods on the soil environment of the yam field,as well as on yam yield and quality.The experiment comprised six treatments in total:one non-mulched treatment served as the control(CK),along with five different film-mulched treatments,namely PE,FZS12,FZS15,FC12,and FC15.The degradation of these films and their effects on soil physicochemical properties,microbial community,yam yield and quality were compared.The results showed that the FZS12 treatment achieved grade 5 degradation by the end of the planting period.Compared with PE treatment,the total soluble sugar content and yield of yam treated with FZS12 were significantly increased by 35.78%and 74.97%,respectively(p<0.05).Compared with CK and PE treatments,FZS12 significantly increased soil available nitrogen by 31.62%and 6.20%,respectively(p<0.05),and significantly increased soil available phosphorus by 8.58%and 4.45%,respectively(p<0.05).Soil pH,available nitrogen,and available phosphorus were the main environmental factors affecting the soil bacterial community.The FZS12 treatment significantly increased the relative abundances of soil bacteria phylum including Acidobacteriota,Myxococcota,Patescibacteria,and Proteobacteria compared with the CK and PE treatments.Functional prediction using Picrust2 revealed that the FZS12 treatment had significantly higher levels of signal transduction and amino acid metabolism than the CK and PE treatments.In conclusion,covering with 12μm PBAT/PLA humic acid biodegradable film enhances yam yield and total soluble sugar content by shaping beneficial soil microbial communities,activating soil nutrients.展开更多
Flexible pressure sensors(FPSs)offer unique benefits for fall detection and rehabilitation training,but conventional FPSs made from synthetic materials have drawbacks,including resource-heavy manufacturing,high costs,...Flexible pressure sensors(FPSs)offer unique benefits for fall detection and rehabilitation training,but conventional FPSs made from synthetic materials have drawbacks,including resource-heavy manufacturing,high costs,and environmental pollution.To address these limitations,this study proposes an innovative fabrication strategy for FPS based on natural materials.The upper and lower electrodes were made by treating a natural wood strip with a flame retardant,converting it into high-quality graphene via a costeffective infrared laser,and transferring it onto starch-based substrates.The dielectric layer was created by electrospinning a composite nanofiber membrane with cyclodextrin and carbon nanotubes.The resulting capacitive FPS shows high sensitivity(2.15 kPa^(-1) within 0-10 kPa),a low detection limit(~6.5 Pa),fast response and recovery times(29 and 39 ms),and excellent long-term stability(over 5000 cycles).It also demonstrates excellent biocompatibility(cell viability>98%)and fully degrades within 6 h.By integrating this sensor with wireless technology,a fall detection and rehabilitation monitoring system was developed.Data processing was handled by a Tiny Machine Learning module on a mobile platform,which transmitted relevant data to a cloud-based platform.The system accurately identified five common fall postures and assisted clinicians in guiding rehabilitation exercises,achieving recognition accuracies of 99%and 100%,respectively,offering a sustainable healthcare solution for the elderly.展开更多
Zn's natural degradability and biocompatibility make it a promising candidate for implants,however,its mechanical properties remain insufficient for bone applications.In this study,the performance of Zn was enhanc...Zn's natural degradability and biocompatibility make it a promising candidate for implants,however,its mechanical properties remain insufficient for bone applications.In this study,the performance of Zn was enhanced by developing Zn-Cu alloys via laser powder bed fusion(LPBF).Optimal LPBF parameters for forming stable tracks were achieved by adjusting laser power and scanning speed.Under optimized conditions of 100 W and 100 mm/s,high density(99.58%)Zn-Cu alloys with improved hardness(68.2 HV)and yield strength(160 MPa)were achieved.These improvements are attributed to solid solution strengthening,segregation strengthening,and grain refinement.The Zn-Cu alloys also demonstrated favorable degradation behavior,with a rate of 0.16 mm/year.This degradation is primarily driven by micro-galvanic corrosion between the CuZn 5 phase and Zn matrix,along with refined grains and increased grain boundary density.This work demonstrates a viable strategy for fabricating Zn-based implants with enhanced structural integrity and mechanical performance via LPBF.展开更多
Poly(butylene adipate-terephthalate)(PBAT),as one of the most common and promising biodegradable plastics,has been widely used in agriculture,packaging,and other industries due to its strong biodegradability propertie...Poly(butylene adipate-terephthalate)(PBAT),as one of the most common and promising biodegradable plastics,has been widely used in agriculture,packaging,and other industries due to its strong biodegradability properties.It is well known that PBAT suffers a series of natural weathering,mechanical wear,hydrolysis,photochemical transformation,and other abiotic degradation processes before being biodegraded.Therefore,it is particularly important to understand the role of abiotic degradation in the life cycle of PBAT.Since the abiotic degradation of PBAT has not been systematically summarized,this review aims to summarize the mechanisms and main factors of the three major abiotic degradation pathways(hydrolysis,photochemical transformation,and thermochemical degradation)of PBAT.It was found that all of them preferentially destroy the chemical bonds with higher energy(especially C-O and C=O)of PBAT,which eventually leads to the shortening of the polymer chain and then leads to reduction in molecular weight.The main factors affecting these abiotic degradations are closely related to the energy or PBAT structure.These findings provide important theoretical and practical guidance for identifying effective methods for PBAT waste management and proposing advanced schemes to regulate the degradation rate of PBAT.展开更多
The organic compound composition ofwastewater,serves as a crucial indicator for the operational performance of activated sludge processes and has a major influence on the development of filamentous bulking in activate...The organic compound composition ofwastewater,serves as a crucial indicator for the operational performance of activated sludge processes and has a major influence on the development of filamentous bulking in activated sludge.This study focused on the impact of typical soluble and slowly-biodegradable organic compounds,investigating the pathways through which these substrates affect the occurrence of filamentous bulking in systems operated under both high-and low-oxygen conditions.Results showed that slowly-biodegradable organic compounds lead to a concentrated distribution of microorganisms within flocs,with inward growth of filamentous bacteria.Both Tween-80 and granular starch treated systems exhibited a significant increase in protein content.The glucose system,utilizing soluble substrates,exhibited a markedly higher total polysaccharide content.Microbial communities in the Tween-80 and granular starch treated systems were characterized by a higher abundance of bacteria known to enhance sludge flocculation and settling,such as Competibacter,Xanthomonadaceae and Zoogloea.These findings are of high significance for controlling the operational performance and stability of activated sludge systems,deepening our understanding and providing a novel perspective for the improvement of wastewater treatment processes.展开更多
In this study,composite films consisting of polylactic acid(PLA),ethyl cellulose(EC),and zein were prepared by solution casting method,and their performance and application in chilled fresh meat preservation were inve...In this study,composite films consisting of polylactic acid(PLA),ethyl cellulose(EC),and zein were prepared by solution casting method,and their performance and application in chilled fresh meat preservation were investigated.The results showed that the three materials had satisfactory compatibility in the composite film.Addition of EC and zein effectively improved the mechanical properties,thermodynamic properties,surface hydrophilicity,oxygen permeability,and degradation properties of PLA films.When the ratio of PLA to EC was 3:7,the tensile strength and elongation at break reached maximum values of 16.6 MPa and 30.5%,respectively.Moreover,under different conditions,the composite film exhibited better degradability than the PLA film.The composite film with a 3:7 ratio of PLA to EC had the best performance,with a degradation rate of 21.75%after 84 days.Chilled fresh meat wrapped with the composite film showed significantly improved antioxidant,antibacterial,and water-holding properties.展开更多
Mesoporous silica nanoparticles(MsNs)are thought to be an attractive drug delivery material because of their advantages including high specific surface area,tunable pore size and morphology,easy sur-face modification ...Mesoporous silica nanoparticles(MsNs)are thought to be an attractive drug delivery material because of their advantages including high specific surface area,tunable pore size and morphology,easy sur-face modification and good biocompatibility.However,as a result of the poor biodegradability of MsNs,their biomedical applications are limited.To break the bottleneck of limited biomedical applications of MSNs,more and more researchers tend to design biodegradable MSNs(b-MSNs)nanosystems to obtain biodegradable as well as safe and reliable drug delivery carriers.In this review,we focused on sum-marizing strategies to improve the degradability of MsNs and innovatively proposed a series of advan-tages of b-MsNs,including controlled cargo release behavior,multifunctional frameworks,nano-catalysis,bio-imaging capabilities and enhanced therapeutic effects.Based on these advantages,we have inno-vatively summarized the applications of b-MsNs for enhanced tumor theranostics,including enhanced chemotherapy,delivery of nanosensitizers,gas molecules and biomacromolecules,initiation of immune response,synergistic therapies and image-guided tumor diagnostics.Finally,the challenges and further clinical translation potential of nanosystems based on b-MsNs are fully discussed and prospected.We believe that such b-MsNs delivery carriers will provide a timely reference for further applications in tu-mor theranostics.展开更多
BACKGROUND Bioresorbable scaffolds(BRS)are a promising alternative to traditional drugeluting stents(DES)for the treatment of acute coronary syndrome(ACS).They offer the potential for complete resorption,which may red...BACKGROUND Bioresorbable scaffolds(BRS)are a promising alternative to traditional drugeluting stents(DES)for the treatment of acute coronary syndrome(ACS).They offer the potential for complete resorption,which may reduce long-term complications such as stent thrombosis and late restenosis.However,the safety,compatibility,and long-term outcomes of BRS in patients with intermediate to low-risk ACS have yet to be thoroughly investigated.AIM To investigate the safety,compatibility,and long-term outcomes of BRS in patients with intermediate to low-risk ACS.METHODS Patients with intermediate to low-risk ACS who underwent percutaneous coronary intervention with either DES or BRS,and were continuously recruited from January 2019 to June 2022 at a single center,were analyzed.Baseline data and clinical follow-up were collected for patients who underwent DES implantation(control group)and BRS implantation(observation group),and the survival outcomes and complications during a maximum follow-up period of 3 years were compared.The primary clinical endpoint was device-oriented composite endpoint(DoCE),representing the occurrence of one of the following events:Cardiac death,stent thrombosis,target vessel myocardial infarction,and clinically driven target lesion revascularization.Secondary endpoints included coronary artery bypass grafting,target vessel revascularization,and non-cardiac death.RESULTS A total of 128 patients were included in this study,with an average age of 63 years.Among them,95 were male(74%).The study involved treatment of 201 blood vessels:87(43%)received BRS,and 114(57%)received DES.A total of 97 patients completed the full 3-year follow-up.During this period,5 patients(17%)in the observation group and 7 patients(16%)in the control group experienced a major cardiovascular event(DoCE).At the 1-year follow-up,7 patients(15%)in the observation group and 6 patients(10%)in the control group experienced DoCE,and this difference was statistically significant(P<0.05).At the 2-year follow-up,there was also a significant difference between the two groups in the number of patients who needed repeat treatment of the target blood vessel(P<0.05).In the observation group,18 patients(33%)underwent follow-up coronary angiography.During the follow-up period,one patient in the observation group was found to have re-narrowing in the proximal and middle segments of the left anterior descending artery,possibly due to BRS collapse.Another patient in the observation group developed chronic total occlusion in multiple vessels at the 3-year follow-up and underwent coronary artery bypass grafting.CONCLUSION In low-to intermediate-risk ACS patients,those who got BRS had their first major heart event sooner than those who got DES.BRS is more tissue-friendly,yet over three years both groups had about the same amount of problems-only a few BRS patients still saw the scaffold collapse or the vessel slowly block.展开更多
This study aimed to develop and characterize biodegradable packaging film from blends of two natural polysaccharides,i.e.,agar and glucomannan.The glucomannan used was derived from the specific tuber plant Amorphophal...This study aimed to develop and characterize biodegradable packaging film from blends of two natural polysaccharides,i.e.,agar and glucomannan.The glucomannan used was derived from the specific tuber plant Amorphophallus oncophyllus(locally known as“porang”),which grows abundantly in Indonesian forests and remains underutilized.Various ratios of agar and porang-glucomannan(PG)proportions were formulated to produce a food packaging film,which was subsequently tested for its mechanical,physical,chemical,and thermal properties.The results showed that the inclusion of PG to the film formulations notably enhanced the stretchability of agar films,achieving maximum a twofold increase,while concurrently reducing their water resistance such as increased water solubility and water swelling for up to 125%and 105%,respectively.The mechanical and thermal properties,as well as the water vapor permeability of the resulting film,were significantly affected by the polymer matrix structure formed by the varying proportions of the two biopolymers.The enhancement of these properties was associated with a more solid/compact film structure,as corroborated by cross-sectional images obtained through SEM analysis.The study’s findings suggest that utilizing agar and porang biomass has significant potential for further development as an environmentally friendly food packaging material.展开更多
Due to its excellent biocompatibility and biodegradability,Mg has received widespread attention in biomaterials as implants and even biobatteries.However,the poor corrosion resistance makes it difficult to meet the gr...Due to its excellent biocompatibility and biodegradability,Mg has received widespread attention in biomaterials as implants and even biobatteries.However,the poor corrosion resistance makes it difficult to meet the growing demand for implant materials.This study developed a biodegradable nano-heterogeneous Mg(48 wt%)-Zn(52 wt%)-based metal(NHMZ)comprising nanocrystalline matrix phase Mg_(51)Zn_(20) and nanoscale MgZn_(2) precipitates.The unique microstructure of NHMZ enhances its corrosion resistance.The spherical aberration-corrected transmission electron microscope(AC-TEM)and precession electron diffraction(PED)characterized the microstructures.The corrosion rate of NHMZ is about 0.21 mm y^(-1) after soaking for 4 weeks,approximately 58% of high pure Mg.In addition,the anode discharge of NHMZ is more stable than Mg,indicating it has great potential in biological batteries.This work hopes to broaden the development direction of biodegradable metallic materials and break through the performance limitation of current biodegradable Mg alloys.展开更多
[Objectives]This study was conducted to investigate the effects of lignin-based fully biodegradable plastic film on the growth and quality of lettuce under open-field cultivation conditions.[Methods]In this experiment...[Objectives]This study was conducted to investigate the effects of lignin-based fully biodegradable plastic film on the growth and quality of lettuce under open-field cultivation conditions.[Methods]In this experiment,compared with bare soil,a polyethylene plastic film(PE)treatment and two lignin-based fully biodegradable plastic film treatments(LBF-0.01 and LBF-0.008)with different thicknesses were set to study the effects on the growth and quality of lettuce.[Results]During autumn cultivation in Shanghai,the thermal insulation performance and yield-increasing effect of the two degradable plastic films were consistent with those of PE film,and effectively met lettuce growth requirements,but treatment LBF-0.01was better than treatment LBF-0.008.Moreover,lignin-based fully biodegradable plastic film could significantly increase the contents of Vc,soluble sugar and carotenoids in lettuce,and treatment LBF-0.008 showed the best effect.It could be seen that under the experimental conditions,the two kinds of lignin-based biodegradable plastic films with different thicknesses could be applied to the cultivation of lettuce in the open field in Shanghai in autumn,and LBF-0.01 had the best effect of increasing temperature and increasing yield,while LBF-0.008 had the best effect of improving quality.[Conclusions]This study provides theoretical basis and technical support for the further application of lignin-based fully biodegradable plastic film.展开更多
Compared with traditional nickel-titanium alloy patent foramen ovale occluders,which are widely used in clinical practice,biodegradable patent foramen ovale occluders have obvious differences in material characteristi...Compared with traditional nickel-titanium alloy patent foramen ovale occluders,which are widely used in clinical practice,biodegradable patent foramen ovale occluders have obvious differences in material characteristics,interventional operation mode and postoperative management strategy.This article gives expert consensus on the selection of clinical indications and standardized operating procedures,so as to standardize the clinical application of biodegradable patent foramen ovale occluders.展开更多
Continuous advancements in medical technology and biomaterials have underscored the significant advantages of biodegradable implant materials for bone repair and remodelling over traditional inert metallic implants.No...Continuous advancements in medical technology and biomaterials have underscored the significant advantages of biodegradable implant materials for bone repair and remodelling over traditional inert metallic implants.Notably,biodegradable magnesium-based materials have gained much attention because of their optimal corrosion rates.Importantly,extensive clinical experience has resulted in the use of biodegradable magnesium-based orthopaedic implants.Both preclinical and clinical studies have consistently demonstrated that Mg has an excellent ability to promote bone tissue formation,a process that is closely associated with the release of Mg^(2+)and other degradation byproducts.Bone metabolism depends on a dynamic balance of bone formation and bone resorption.Mg^(2+)has been shown to increase osteoblast(OB)activity while suppressing osteoclast(OC)formation,thus playing a crucial role in bone remodelling and regeneration.In terms of osteolysis inhibition,Mg^(2+)plays a multifaceted role.First,Mg^(2+)inhibits OC formation by modulating the activity of mature OCs,their migratory behaviour and the activity of precursor cells.Second,Mg^(2+)influences OC production by regulating the expression of osteoprotegerin(OPG),receptor activator of nuclear factor kappa-Βligand(RANKL)and nuclear factor kappa-light-chain-enhancer of activated B cells(NF-κB).Additionally,Mg^(2+)impacts bone resorption by altering the immune microenvironment and the levels of hormones and peptides within the body.Furthermore,the alkaline environment generated around the biodegradable magnesium implant and its degradation products(e.g.H2)also significantly inhibit OC formation.Recent research on magnesium-based implants has focused predominantly on their osteogenic properties,with few systematic reviews addressing the mechanisms through which biodegradable magnesium alloys suppress osteoclastic activity.This article summarizes the latest clinical research progress concerning biodegradable magnesium implant materials and their significant regulatory effects and discusses recent advances in the understanding of the regulatory mechanisms of action Mg-based biomaterials on OCs,with the aim of providing a more theoretical basis for the clinical application of biodegradable magnesium-based implants.展开更多
Nowadays,the development of effective bioplastics aims to combine traditional plastics’functionality with environmentally friendly properties.The most effective and durable modern bioplastics are made from the edible...Nowadays,the development of effective bioplastics aims to combine traditional plastics’functionality with environmentally friendly properties.The most effective and durable modern bioplastics are made from the edible part of crops.This forces bioplastics to competewith food production because the crops that produce bioplastics can also be used for human nutrition.That is why the article’s main focus is on creating bioplastics using renewable,non-food raw materials(cellulose,lignin,etc.).Eco-friendly composites based on a renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch,and poly(lactic acid)with reed and hemp waste as a filler.The physic-chemical features of the structure and surface,as well as the technological characteristics of reed and hemp waste as the organic fillers for renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch,and poly(lactic acid),were studied.Theeffect of the fractional composition analysis,morphology,and nature of reed and hempwaste on the quality of the design of eco-friendly biodegradable composites and their ability to disperse in the matrix of renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch and poly(lactic acid)was carried out.The influence of different content and morphology of reed and hemp waste on the composite characteristics was investigated.It is shown that the most optimal direction for obtaining strong eco-friendly biodegradable composites based on a renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch,and poly(lactic acid)is associated with the use of waste reed stalks,with its optimal content at the level of 50 wt.%.展开更多
Magnesium(Mg)alloys with biodegradability and excellent mechanical properties are in high demand for applications in guided bone regeneration(GBR).However,the clinical application of Mg alloys is hindered by infection...Magnesium(Mg)alloys with biodegradability and excellent mechanical properties are in high demand for applications in guided bone regeneration(GBR).However,the clinical application of Mg alloys is hindered by infection risks and limited osteogenesis.Herein,a structure-functional integrated Mg-Ca/Mg-Cu bilayer membrane was rolled at 150℃through various single-pass reductions by using online heating rolling.The Mg-Cu layer was specifically engineered to exhibit antibacterial properties tailored for gingival tissue,while the Mg-Ca layer was designed to support bone regeneration within the defect cavity.The bilayer membrane demonstrated a flexural yield strength of 421.0 MPa and a modulus of 58.6 GPa,indicating exceptional deformation resistance.Furthermore,it maintained notable structural stability by retaining 86.4%of its volume after 21 days in Hanks'solution.In vitro results revealed that the bilayer membrane exhibited favorable biocompatibility and promoted osteogenesis via the synergetic effect of released Mg^(2+)and Ca^(2+)ions.The rapid release of Cu^(2+)ions and the creation of an alkaline environment further improved antibacterial properties,potentially preventing postoperative infections.Additionally,in an in vivo rat calvarial defect model,the membrane demonstrated its capability to stimulate new bone formation.In summary,the Mg-Ca/Mg-Cu bilayer membrane exhibited outstanding mechanical stability,favorable corrosion rates,extraordinary osteogenic and antibacterial activity simultaneously.Consequently,it holds promise as a robust barrier membrane in GBR applications.展开更多
The current global shortage of oil resources and the pollution problems caused by traditional barrier materials urgently require the search for new substitutes.Biodegradable bio-based barrier materials possess the cha...The current global shortage of oil resources and the pollution problems caused by traditional barrier materials urgently require the search for new substitutes.Biodegradable bio-based barrier materials possess the characteristics of being renewable,environmentally friendly,and having excellent barrier properties.They have become an important choice in fields such as food packaging,agricultural film covering,and medical protection.This review systematically analyzes the design and research of this type of material,classifying biobased and biodegradable barrier materials based on the sources of raw materials and synthesis pathways.It also provides a detailed introduction to the latest research progress of biobased and biodegradable barrier materials,discussing the synthesis methods and improvement measures of their barrier properties.Subsequently,it analyzes the related technologies for enhancing the barrier properties of biobased and biodegradable barrier materials,and finally looks forward to the directions that future research should focus on,promoting the transition of biobased and biodegradable barrier materials from the laboratory to industrial applications.展开更多
Polymeric materials,known for their lightweight and strength,are widely used today.However,their non-biodegradable nature poses significant environmental challenges.This research aimed to develop biodegradable films f...Polymeric materials,known for their lightweight and strength,are widely used today.However,their non-biodegradable nature poses significant environmental challenges.This research aimed to develop biodegradable films from fruits and vegetables,using alginate as a binding agent.Using a completely randomized design,seven experimental sets were prepared with carrots,Kimju guava,and Namwa banana peel fibers as the primary materials and alginate as the secondary material at three levels:1.2,1.8,and 2.4 by weight.The solution technique was employed to create the samples.Upon testing mechanical and physical properties,experimental set 3,consisting of 60%guava and 1.8%alginate,emerged as the optimal ratio.This combination exhibited favorable physical properties,including a thickness of 0.26±0.02 mm,meeting the standards for food packaging films.Additionally,the tensile strength was 0.50±0.01 N/m²,and the elongation at break was 55.60±0.44%.Regarding chemical properties,the moisture content of 5.64±0.03%fell within the acceptable range for dried food.Furthermore,a 30-day soil burial test revealed that the sample from experimental set 3 exhibited the highest degradation rate.In conclusion,these findings suggest that guava can be a promising raw material for producing biodegradable plastics suitable for packaging applications.展开更多
Biodegradable implants have emerged in biomedical applications,particularly for orthopedic fixations,cardiovascular stents,and tissue engineering scaffolds.Unlike permanent implants,they are designed to degrade and be...Biodegradable implants have emerged in biomedical applications,particularly for orthopedic fixations,cardiovascular stents,and tissue engineering scaffolds.Unlike permanent implants,they are designed to degrade and be reabsorbed after implantation in the body,mitigating the need for additional surgeries and reducing associated complications.In particular,Fe-Mn-C alloys constitute a new class of promising metallic materials for medical applications due to their outstanding mechanical properties and their bio-logical performances.This study focuses on improving the degradation rates and cytotoxicity of sintered Fe-Mn-C alloys produced using the powder metallurgy process.To evaluate the impact of different pow-der preparation methods on material properties,two types of powders were used:(1)MX,prepared by mixing Fe,Mn,and C powders for 1 h;and(2)MM,obtained by mechanically milling the same powders for 10 h.Four mixtures with varying proportions of MX and MM were prepared.Two groups of samples were produced:one entirely from MX(A0),and another containing MM at 25 wt.%(A25),50 wt.%(A50),and 75 wt.%(A75).All samples exhibited a complex microstructure comprising ferrite,martensite,and residual austenite.Degradation behavior assessment in Hanks’solution over 14 days showed that adding MM increased the degradation rate,from around 0.04 mmpy for A0 to 0.12 mmpy for A25.Notably,all samples showed similar cell viability,in the range of 83%-89%for 1%extract dilution,and were non-hemolytic,with a hemolysis percentage below 1%.展开更多
Bioresorbable stents(BRS)have emerged as a groundbreaking development in the field of percutaneous coronary intervention(PCI)as they address the long-standing concerns of metallic stents.Nevertheless,the observed high...Bioresorbable stents(BRS)have emerged as a groundbreaking development in the field of percutaneous coronary intervention(PCI)as they address the long-standing concerns of metallic stents.Nevertheless,the observed higher thrombosis rates in the first generation BRS,i.e.ABSORB®,might be attributed to their thicker struts,slower degradation rate and structural dismantling of partially endothelialized stents.In this study,measures have been taken to overcome these limitations include reducing strut thickness,modifying the structural design to maintain radial strength with thinner round cross section struts and using a new material poly(L-lactide-co-ɛ-caprolactone)(PLCL 95/5)that is tougher and degrade faster than poly(L-lactic acid)(PLLA).Given the excellent biocompatibility of PLCL materials,the US FDA has approved their use in clinical applications.PLCL stents can be used to treat diseases such as tracheal stenosis and tracheoesophageal fistula,and can also be applied in the construction of other tissue engineering stents,such as nerve conduitsand fat filling stents.The newly designed coronary stents were fabricated using a 3D printing technology with a rotating platform,coated with a paclitaxel coating and comprehensive in vitro research was conducted.It was the first to undergo tests in animals.Results showed the novel paclitaxel eluting PLCL stents had super-flexible structure,thinner round cross-sectional struts,a faster degradation profile and satisfactory hemocompatibility.With a paclitaxel dose of 0.57μg/mm^(2),the drug eluting stents showed very low degree of stenosis within 6 months of implantation in a porcine model.Overall,the results showed that the novel 3D printed PLCL drug eluting stent is a very promising candidate for next generation bioresorbable coronary stent.展开更多
基金supported by the Jiangsu Provincial Natural Science Foundation(BK20240685)the Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,Jianghan University(JDGD202309)。
文摘Growing demand for sustainable,high-performance materials is driving research to replace petroleumbased plastics with abundant biomass,especially cellulose.However,the effective modification and functionalization of cellulose is often impeded by complex processing requirements and limited performance tunability.Here,an innovative“active”green medium strategy based on an ethyl cellulose/thymol eutectic system is reported,enabling in situ chemical modification of eutectic components and the construction of dynamic self-adaptive networks without external catalysts or initiators.Through precise molecular design,dynamic boroxine networks and acrylate crosslinking networks are synergistically integrated into the cellulosic bioplastic(CBP)matrix.The resulting CBP-A2B8 exhibits exceptional optical transparency(~85%),superior mechanical properties(tensile strength~30 MPa),facile thermal processability,and closed-loop recyclability.Its chemical structure and mechanical performance remain highly stable even after 20 hot-compression recycling cycles.Complete biodegradation occurs under natural environmental conditions within approximately 100 days.Furthermore,the bioplastic,when combined with silver nanowires,forms high-performance flexible transparent conductive films successfully applied in customizable electroluminescent devices.Post-lifecycle,device components(silver nanowires and CBP matrix)are efficiently separated and recycled using a straightforward solvent-based method.This eutectic system-mediated strategy offers a novel pathway for the development of sustainable,high-performance bioplastics with a closed-loop lifecycle.
基金supported by the Wencheng County Science and Technology Plan Project(2023NKY03)Earmarked Fund for Modern Agro-industry Technology Research System(Grant Number CARS-24-B04,CARS-23-B05)Additional support was provided by Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(Vegetables),Ministry of Agriculture and Rural Affairs,China.
文摘To address the issue of residual pollution caused by polyethylene mulch,this study explored the effects of different mulching methods on the soil environment of the yam field,as well as on yam yield and quality.The experiment comprised six treatments in total:one non-mulched treatment served as the control(CK),along with five different film-mulched treatments,namely PE,FZS12,FZS15,FC12,and FC15.The degradation of these films and their effects on soil physicochemical properties,microbial community,yam yield and quality were compared.The results showed that the FZS12 treatment achieved grade 5 degradation by the end of the planting period.Compared with PE treatment,the total soluble sugar content and yield of yam treated with FZS12 were significantly increased by 35.78%and 74.97%,respectively(p<0.05).Compared with CK and PE treatments,FZS12 significantly increased soil available nitrogen by 31.62%and 6.20%,respectively(p<0.05),and significantly increased soil available phosphorus by 8.58%and 4.45%,respectively(p<0.05).Soil pH,available nitrogen,and available phosphorus were the main environmental factors affecting the soil bacterial community.The FZS12 treatment significantly increased the relative abundances of soil bacteria phylum including Acidobacteriota,Myxococcota,Patescibacteria,and Proteobacteria compared with the CK and PE treatments.Functional prediction using Picrust2 revealed that the FZS12 treatment had significantly higher levels of signal transduction and amino acid metabolism than the CK and PE treatments.In conclusion,covering with 12μm PBAT/PLA humic acid biodegradable film enhances yam yield and total soluble sugar content by shaping beneficial soil microbial communities,activating soil nutrients.
基金supported by the National Natural Science Foundation of China(62301291,61904092,and 62181240278)Natural Science Foundation of Shandong Province(ZR2025MS1072)+1 种基金Youth Innovation Team Project of Shandong Provincial Education Department(2022KJ141)Taishan Scholars Project Special Funds(tsqn202312035)。
文摘Flexible pressure sensors(FPSs)offer unique benefits for fall detection and rehabilitation training,but conventional FPSs made from synthetic materials have drawbacks,including resource-heavy manufacturing,high costs,and environmental pollution.To address these limitations,this study proposes an innovative fabrication strategy for FPS based on natural materials.The upper and lower electrodes were made by treating a natural wood strip with a flame retardant,converting it into high-quality graphene via a costeffective infrared laser,and transferring it onto starch-based substrates.The dielectric layer was created by electrospinning a composite nanofiber membrane with cyclodextrin and carbon nanotubes.The resulting capacitive FPS shows high sensitivity(2.15 kPa^(-1) within 0-10 kPa),a low detection limit(~6.5 Pa),fast response and recovery times(29 and 39 ms),and excellent long-term stability(over 5000 cycles).It also demonstrates excellent biocompatibility(cell viability>98%)and fully degrades within 6 h.By integrating this sensor with wireless technology,a fall detection and rehabilitation monitoring system was developed.Data processing was handled by a Tiny Machine Learning module on a mobile platform,which transmitted relevant data to a cloud-based platform.The system accurately identified five common fall postures and assisted clinicians in guiding rehabilitation exercises,achieving recognition accuracies of 99%and 100%,respectively,offering a sustainable healthcare solution for the elderly.
基金Projects(52571276,52275395,U24A20120,52475362)supported by the National Natural Science Foundation of ChinaProject(2025JJ30015)supported by the Hunan Provincial Natural Science Foundation,China+3 种基金Project(2023RC3046)supported by the Science and Technology Innovation Program of Hunan Province,ChinaProject(2023YFB4605800)supported by National Key Research and Development Program of ChinaProject(2023CXQD023)supported by the Central South University Innovation-Driven Research Programme,ChinaProject supported by the State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,China。
文摘Zn's natural degradability and biocompatibility make it a promising candidate for implants,however,its mechanical properties remain insufficient for bone applications.In this study,the performance of Zn was enhanced by developing Zn-Cu alloys via laser powder bed fusion(LPBF).Optimal LPBF parameters for forming stable tracks were achieved by adjusting laser power and scanning speed.Under optimized conditions of 100 W and 100 mm/s,high density(99.58%)Zn-Cu alloys with improved hardness(68.2 HV)and yield strength(160 MPa)were achieved.These improvements are attributed to solid solution strengthening,segregation strengthening,and grain refinement.The Zn-Cu alloys also demonstrated favorable degradation behavior,with a rate of 0.16 mm/year.This degradation is primarily driven by micro-galvanic corrosion between the CuZn 5 phase and Zn matrix,along with refined grains and increased grain boundary density.This work demonstrates a viable strategy for fabricating Zn-based implants with enhanced structural integrity and mechanical performance via LPBF.
基金supported by the National Key R&D Program of China(No.2022YFC3901800)the National Natural Science Foundation of China(No.22176041)Guangzhou Science and Technology Planning Project(No.2023A04J0918)。
文摘Poly(butylene adipate-terephthalate)(PBAT),as one of the most common and promising biodegradable plastics,has been widely used in agriculture,packaging,and other industries due to its strong biodegradability properties.It is well known that PBAT suffers a series of natural weathering,mechanical wear,hydrolysis,photochemical transformation,and other abiotic degradation processes before being biodegraded.Therefore,it is particularly important to understand the role of abiotic degradation in the life cycle of PBAT.Since the abiotic degradation of PBAT has not been systematically summarized,this review aims to summarize the mechanisms and main factors of the three major abiotic degradation pathways(hydrolysis,photochemical transformation,and thermochemical degradation)of PBAT.It was found that all of them preferentially destroy the chemical bonds with higher energy(especially C-O and C=O)of PBAT,which eventually leads to the shortening of the polymer chain and then leads to reduction in molecular weight.The main factors affecting these abiotic degradations are closely related to the energy or PBAT structure.These findings provide important theoretical and practical guidance for identifying effective methods for PBAT waste management and proposing advanced schemes to regulate the degradation rate of PBAT.
基金supported by the Opening Project of National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,and the National Natural Science Foundation of China(No.52270017).
文摘The organic compound composition ofwastewater,serves as a crucial indicator for the operational performance of activated sludge processes and has a major influence on the development of filamentous bulking in activated sludge.This study focused on the impact of typical soluble and slowly-biodegradable organic compounds,investigating the pathways through which these substrates affect the occurrence of filamentous bulking in systems operated under both high-and low-oxygen conditions.Results showed that slowly-biodegradable organic compounds lead to a concentrated distribution of microorganisms within flocs,with inward growth of filamentous bacteria.Both Tween-80 and granular starch treated systems exhibited a significant increase in protein content.The glucose system,utilizing soluble substrates,exhibited a markedly higher total polysaccharide content.Microbial communities in the Tween-80 and granular starch treated systems were characterized by a higher abundance of bacteria known to enhance sludge flocculation and settling,such as Competibacter,Xanthomonadaceae and Zoogloea.These findings are of high significance for controlling the operational performance and stability of activated sludge systems,deepening our understanding and providing a novel perspective for the improvement of wastewater treatment processes.
文摘In this study,composite films consisting of polylactic acid(PLA),ethyl cellulose(EC),and zein were prepared by solution casting method,and their performance and application in chilled fresh meat preservation were investigated.The results showed that the three materials had satisfactory compatibility in the composite film.Addition of EC and zein effectively improved the mechanical properties,thermodynamic properties,surface hydrophilicity,oxygen permeability,and degradation properties of PLA films.When the ratio of PLA to EC was 3:7,the tensile strength and elongation at break reached maximum values of 16.6 MPa and 30.5%,respectively.Moreover,under different conditions,the composite film exhibited better degradability than the PLA film.The composite film with a 3:7 ratio of PLA to EC had the best performance,with a degradation rate of 21.75%after 84 days.Chilled fresh meat wrapped with the composite film showed significantly improved antioxidant,antibacterial,and water-holding properties.
基金from"XingLiao Talent Program"of Liaoning Province(No.XLYC2203156)Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program(No.RC220397)are greatly acknowledged。
文摘Mesoporous silica nanoparticles(MsNs)are thought to be an attractive drug delivery material because of their advantages including high specific surface area,tunable pore size and morphology,easy sur-face modification and good biocompatibility.However,as a result of the poor biodegradability of MsNs,their biomedical applications are limited.To break the bottleneck of limited biomedical applications of MSNs,more and more researchers tend to design biodegradable MSNs(b-MSNs)nanosystems to obtain biodegradable as well as safe and reliable drug delivery carriers.In this review,we focused on sum-marizing strategies to improve the degradability of MsNs and innovatively proposed a series of advan-tages of b-MsNs,including controlled cargo release behavior,multifunctional frameworks,nano-catalysis,bio-imaging capabilities and enhanced therapeutic effects.Based on these advantages,we have inno-vatively summarized the applications of b-MsNs for enhanced tumor theranostics,including enhanced chemotherapy,delivery of nanosensitizers,gas molecules and biomacromolecules,initiation of immune response,synergistic therapies and image-guided tumor diagnostics.Finally,the challenges and further clinical translation potential of nanosystems based on b-MsNs are fully discussed and prospected.We believe that such b-MsNs delivery carriers will provide a timely reference for further applications in tu-mor theranostics.
文摘BACKGROUND Bioresorbable scaffolds(BRS)are a promising alternative to traditional drugeluting stents(DES)for the treatment of acute coronary syndrome(ACS).They offer the potential for complete resorption,which may reduce long-term complications such as stent thrombosis and late restenosis.However,the safety,compatibility,and long-term outcomes of BRS in patients with intermediate to low-risk ACS have yet to be thoroughly investigated.AIM To investigate the safety,compatibility,and long-term outcomes of BRS in patients with intermediate to low-risk ACS.METHODS Patients with intermediate to low-risk ACS who underwent percutaneous coronary intervention with either DES or BRS,and were continuously recruited from January 2019 to June 2022 at a single center,were analyzed.Baseline data and clinical follow-up were collected for patients who underwent DES implantation(control group)and BRS implantation(observation group),and the survival outcomes and complications during a maximum follow-up period of 3 years were compared.The primary clinical endpoint was device-oriented composite endpoint(DoCE),representing the occurrence of one of the following events:Cardiac death,stent thrombosis,target vessel myocardial infarction,and clinically driven target lesion revascularization.Secondary endpoints included coronary artery bypass grafting,target vessel revascularization,and non-cardiac death.RESULTS A total of 128 patients were included in this study,with an average age of 63 years.Among them,95 were male(74%).The study involved treatment of 201 blood vessels:87(43%)received BRS,and 114(57%)received DES.A total of 97 patients completed the full 3-year follow-up.During this period,5 patients(17%)in the observation group and 7 patients(16%)in the control group experienced a major cardiovascular event(DoCE).At the 1-year follow-up,7 patients(15%)in the observation group and 6 patients(10%)in the control group experienced DoCE,and this difference was statistically significant(P<0.05).At the 2-year follow-up,there was also a significant difference between the two groups in the number of patients who needed repeat treatment of the target blood vessel(P<0.05).In the observation group,18 patients(33%)underwent follow-up coronary angiography.During the follow-up period,one patient in the observation group was found to have re-narrowing in the proximal and middle segments of the left anterior descending artery,possibly due to BRS collapse.Another patient in the observation group developed chronic total occlusion in multiple vessels at the 3-year follow-up and underwent coronary artery bypass grafting.CONCLUSION In low-to intermediate-risk ACS patients,those who got BRS had their first major heart event sooner than those who got DES.BRS is more tissue-friendly,yet over three years both groups had about the same amount of problems-only a few BRS patients still saw the scaffold collapse or the vessel slowly block.
基金funded by a research grant from the Lembaga Pengelola Dana Pendidikan-Ministry of Finance Republic of Indonesia(https://risprolpdp.kemenkeu.go.id/)(accessed on 13 September 2024)awarded under the Riset dan Inovasi untuk Indonesia Maju program with grant number 82/II.7/HK/2022.
文摘This study aimed to develop and characterize biodegradable packaging film from blends of two natural polysaccharides,i.e.,agar and glucomannan.The glucomannan used was derived from the specific tuber plant Amorphophallus oncophyllus(locally known as“porang”),which grows abundantly in Indonesian forests and remains underutilized.Various ratios of agar and porang-glucomannan(PG)proportions were formulated to produce a food packaging film,which was subsequently tested for its mechanical,physical,chemical,and thermal properties.The results showed that the inclusion of PG to the film formulations notably enhanced the stretchability of agar films,achieving maximum a twofold increase,while concurrently reducing their water resistance such as increased water solubility and water swelling for up to 125%and 105%,respectively.The mechanical and thermal properties,as well as the water vapor permeability of the resulting film,were significantly affected by the polymer matrix structure formed by the varying proportions of the two biopolymers.The enhancement of these properties was associated with a more solid/compact film structure,as corroborated by cross-sectional images obtained through SEM analysis.The study’s findings suggest that utilizing agar and porang biomass has significant potential for further development as an environmentally friendly food packaging material.
基金supported by grants from the National Natural Science Foundation of China(No.52201300)the National Key R&D Program of China(No.2023YFC2416800)+1 种基金China Postdoctoral Science Foundation(No.2021M702090)Changshu Science and Technology Program(Industrial)Project(No.CG202107).
文摘Due to its excellent biocompatibility and biodegradability,Mg has received widespread attention in biomaterials as implants and even biobatteries.However,the poor corrosion resistance makes it difficult to meet the growing demand for implant materials.This study developed a biodegradable nano-heterogeneous Mg(48 wt%)-Zn(52 wt%)-based metal(NHMZ)comprising nanocrystalline matrix phase Mg_(51)Zn_(20) and nanoscale MgZn_(2) precipitates.The unique microstructure of NHMZ enhances its corrosion resistance.The spherical aberration-corrected transmission electron microscope(AC-TEM)and precession electron diffraction(PED)characterized the microstructures.The corrosion rate of NHMZ is about 0.21 mm y^(-1) after soaking for 4 weeks,approximately 58% of high pure Mg.In addition,the anode discharge of NHMZ is more stable than Mg,indicating it has great potential in biological batteries.This work hopes to broaden the development direction of biodegradable metallic materials and break through the performance limitation of current biodegradable Mg alloys.
基金Supported by Shanghai Science and Technology Innovation Action Plan,China(22N51900900).
文摘[Objectives]This study was conducted to investigate the effects of lignin-based fully biodegradable plastic film on the growth and quality of lettuce under open-field cultivation conditions.[Methods]In this experiment,compared with bare soil,a polyethylene plastic film(PE)treatment and two lignin-based fully biodegradable plastic film treatments(LBF-0.01 and LBF-0.008)with different thicknesses were set to study the effects on the growth and quality of lettuce.[Results]During autumn cultivation in Shanghai,the thermal insulation performance and yield-increasing effect of the two degradable plastic films were consistent with those of PE film,and effectively met lettuce growth requirements,but treatment LBF-0.01was better than treatment LBF-0.008.Moreover,lignin-based fully biodegradable plastic film could significantly increase the contents of Vc,soluble sugar and carotenoids in lettuce,and treatment LBF-0.008 showed the best effect.It could be seen that under the experimental conditions,the two kinds of lignin-based biodegradable plastic films with different thicknesses could be applied to the cultivation of lettuce in the open field in Shanghai in autumn,and LBF-0.01 had the best effect of increasing temperature and increasing yield,while LBF-0.008 had the best effect of improving quality.[Conclusions]This study provides theoretical basis and technical support for the further application of lignin-based fully biodegradable plastic film.
基金Chinese Academy of Medical Sciences Fuwai Hospital High Level Hospital clinical research fund(2022-GSPGG-18).
文摘Compared with traditional nickel-titanium alloy patent foramen ovale occluders,which are widely used in clinical practice,biodegradable patent foramen ovale occluders have obvious differences in material characteristics,interventional operation mode and postoperative management strategy.This article gives expert consensus on the selection of clinical indications and standardized operating procedures,so as to standardize the clinical application of biodegradable patent foramen ovale occluders.
基金supported by Dalian Key Medical Specialties"Peak Climbing"Program(No.2021[243])China Postdoctoral Science Foundation(No.2021M690494)+3 种基金Dongguan Science and Technology of Social Development Program(20211800904602)Youth Star of Science and Technology of Dalian(No.2022RQ001)Liaoning Provincial Science and Technology Plan Joint Plan(No.2024-MSLH-012)Dalian Life and Health Sector Guidance Program(No.2024ZDJH01PT141).
文摘Continuous advancements in medical technology and biomaterials have underscored the significant advantages of biodegradable implant materials for bone repair and remodelling over traditional inert metallic implants.Notably,biodegradable magnesium-based materials have gained much attention because of their optimal corrosion rates.Importantly,extensive clinical experience has resulted in the use of biodegradable magnesium-based orthopaedic implants.Both preclinical and clinical studies have consistently demonstrated that Mg has an excellent ability to promote bone tissue formation,a process that is closely associated with the release of Mg^(2+)and other degradation byproducts.Bone metabolism depends on a dynamic balance of bone formation and bone resorption.Mg^(2+)has been shown to increase osteoblast(OB)activity while suppressing osteoclast(OC)formation,thus playing a crucial role in bone remodelling and regeneration.In terms of osteolysis inhibition,Mg^(2+)plays a multifaceted role.First,Mg^(2+)inhibits OC formation by modulating the activity of mature OCs,their migratory behaviour and the activity of precursor cells.Second,Mg^(2+)influences OC production by regulating the expression of osteoprotegerin(OPG),receptor activator of nuclear factor kappa-Βligand(RANKL)and nuclear factor kappa-light-chain-enhancer of activated B cells(NF-κB).Additionally,Mg^(2+)impacts bone resorption by altering the immune microenvironment and the levels of hormones and peptides within the body.Furthermore,the alkaline environment generated around the biodegradable magnesium implant and its degradation products(e.g.H2)also significantly inhibit OC formation.Recent research on magnesium-based implants has focused predominantly on their osteogenic properties,with few systematic reviews addressing the mechanisms through which biodegradable magnesium alloys suppress osteoclastic activity.This article summarizes the latest clinical research progress concerning biodegradable magnesium implant materials and their significant regulatory effects and discusses recent advances in the understanding of the regulatory mechanisms of action Mg-based biomaterials on OCs,with the aim of providing a more theoretical basis for the clinical application of biodegradable magnesium-based implants.
文摘Nowadays,the development of effective bioplastics aims to combine traditional plastics’functionality with environmentally friendly properties.The most effective and durable modern bioplastics are made from the edible part of crops.This forces bioplastics to competewith food production because the crops that produce bioplastics can also be used for human nutrition.That is why the article’s main focus is on creating bioplastics using renewable,non-food raw materials(cellulose,lignin,etc.).Eco-friendly composites based on a renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch,and poly(lactic acid)with reed and hemp waste as a filler.The physic-chemical features of the structure and surface,as well as the technological characteristics of reed and hemp waste as the organic fillers for renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch,and poly(lactic acid),were studied.Theeffect of the fractional composition analysis,morphology,and nature of reed and hempwaste on the quality of the design of eco-friendly biodegradable composites and their ability to disperse in the matrix of renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch and poly(lactic acid)was carried out.The influence of different content and morphology of reed and hemp waste on the composite characteristics was investigated.It is shown that the most optimal direction for obtaining strong eco-friendly biodegradable composites based on a renewable bioplastic blend of polybutylene adipate-co-terephthalate,corn starch,and poly(lactic acid)is associated with the use of waste reed stalks,with its optimal content at the level of 50 wt.%.
基金supported by the National Natural Science Foundation of China(51972339,52072023,and 51802350)the National Natural Science Found for Distinguished Young Scholars(52225101)+3 种基金the China Postdoctoral Science Foundation(2022M720551)the Natural Science Foundation of Chongqing(CSTB2023NSCQ-MSX0527,cstc2021jcyj-msxmX0993)the Chongqing Academician Special Fund(2022YSZX-JCX0014CSTB)the Chongqing Science and Technology Commission(CSTB2022NSCQ-MSX0416).
文摘Magnesium(Mg)alloys with biodegradability and excellent mechanical properties are in high demand for applications in guided bone regeneration(GBR).However,the clinical application of Mg alloys is hindered by infection risks and limited osteogenesis.Herein,a structure-functional integrated Mg-Ca/Mg-Cu bilayer membrane was rolled at 150℃through various single-pass reductions by using online heating rolling.The Mg-Cu layer was specifically engineered to exhibit antibacterial properties tailored for gingival tissue,while the Mg-Ca layer was designed to support bone regeneration within the defect cavity.The bilayer membrane demonstrated a flexural yield strength of 421.0 MPa and a modulus of 58.6 GPa,indicating exceptional deformation resistance.Furthermore,it maintained notable structural stability by retaining 86.4%of its volume after 21 days in Hanks'solution.In vitro results revealed that the bilayer membrane exhibited favorable biocompatibility and promoted osteogenesis via the synergetic effect of released Mg^(2+)and Ca^(2+)ions.The rapid release of Cu^(2+)ions and the creation of an alkaline environment further improved antibacterial properties,potentially preventing postoperative infections.Additionally,in an in vivo rat calvarial defect model,the membrane demonstrated its capability to stimulate new bone formation.In summary,the Mg-Ca/Mg-Cu bilayer membrane exhibited outstanding mechanical stability,favorable corrosion rates,extraordinary osteogenic and antibacterial activity simultaneously.Consequently,it holds promise as a robust barrier membrane in GBR applications.
基金supported by the Science and Technology Research Project of Henan Province(222102230031)Key Scientific Research Projects of Colleges and Universities in Henan Province(23A430018)Natural Science Foundation of Henan(252300420267).
文摘The current global shortage of oil resources and the pollution problems caused by traditional barrier materials urgently require the search for new substitutes.Biodegradable bio-based barrier materials possess the characteristics of being renewable,environmentally friendly,and having excellent barrier properties.They have become an important choice in fields such as food packaging,agricultural film covering,and medical protection.This review systematically analyzes the design and research of this type of material,classifying biobased and biodegradable barrier materials based on the sources of raw materials and synthesis pathways.It also provides a detailed introduction to the latest research progress of biobased and biodegradable barrier materials,discussing the synthesis methods and improvement measures of their barrier properties.Subsequently,it analyzes the related technologies for enhancing the barrier properties of biobased and biodegradable barrier materials,and finally looks forward to the directions that future research should focus on,promoting the transition of biobased and biodegradable barrier materials from the laboratory to industrial applications.
基金funding from the Environmental Science Program for Academic Excellence and Community Research for Fiscal Year 2024,a financial resource of the Environmental Science and Technology Program,Faculty of Science,Buriram Rajabhat University.Additionally,Buriram Rajabhat University provided a publication budget.
文摘Polymeric materials,known for their lightweight and strength,are widely used today.However,their non-biodegradable nature poses significant environmental challenges.This research aimed to develop biodegradable films from fruits and vegetables,using alginate as a binding agent.Using a completely randomized design,seven experimental sets were prepared with carrots,Kimju guava,and Namwa banana peel fibers as the primary materials and alginate as the secondary material at three levels:1.2,1.8,and 2.4 by weight.The solution technique was employed to create the samples.Upon testing mechanical and physical properties,experimental set 3,consisting of 60%guava and 1.8%alginate,emerged as the optimal ratio.This combination exhibited favorable physical properties,including a thickness of 0.26±0.02 mm,meeting the standards for food packaging films.Additionally,the tensile strength was 0.50±0.01 N/m²,and the elongation at break was 55.60±0.44%.Regarding chemical properties,the moisture content of 5.64±0.03%fell within the acceptable range for dried food.Furthermore,a 30-day soil burial test revealed that the sample from experimental set 3 exhibited the highest degradation rate.In conclusion,these findings suggest that guava can be a promising raw material for producing biodegradable plastics suitable for packaging applications.
基金supported by the Natural Science and En-gineering Research Council of Canada(Discovery and Alliance),and PRIMA(Quebec Ministry for Economy and Innovation).
文摘Biodegradable implants have emerged in biomedical applications,particularly for orthopedic fixations,cardiovascular stents,and tissue engineering scaffolds.Unlike permanent implants,they are designed to degrade and be reabsorbed after implantation in the body,mitigating the need for additional surgeries and reducing associated complications.In particular,Fe-Mn-C alloys constitute a new class of promising metallic materials for medical applications due to their outstanding mechanical properties and their bio-logical performances.This study focuses on improving the degradation rates and cytotoxicity of sintered Fe-Mn-C alloys produced using the powder metallurgy process.To evaluate the impact of different pow-der preparation methods on material properties,two types of powders were used:(1)MX,prepared by mixing Fe,Mn,and C powders for 1 h;and(2)MM,obtained by mechanically milling the same powders for 10 h.Four mixtures with varying proportions of MX and MM were prepared.Two groups of samples were produced:one entirely from MX(A0),and another containing MM at 25 wt.%(A25),50 wt.%(A50),and 75 wt.%(A75).All samples exhibited a complex microstructure comprising ferrite,martensite,and residual austenite.Degradation behavior assessment in Hanks’solution over 14 days showed that adding MM increased the degradation rate,from around 0.04 mmpy for A0 to 0.12 mmpy for A25.Notably,all samples showed similar cell viability,in the range of 83%-89%for 1%extract dilution,and were non-hemolytic,with a hemolysis percentage below 1%.
文摘Bioresorbable stents(BRS)have emerged as a groundbreaking development in the field of percutaneous coronary intervention(PCI)as they address the long-standing concerns of metallic stents.Nevertheless,the observed higher thrombosis rates in the first generation BRS,i.e.ABSORB®,might be attributed to their thicker struts,slower degradation rate and structural dismantling of partially endothelialized stents.In this study,measures have been taken to overcome these limitations include reducing strut thickness,modifying the structural design to maintain radial strength with thinner round cross section struts and using a new material poly(L-lactide-co-ɛ-caprolactone)(PLCL 95/5)that is tougher and degrade faster than poly(L-lactic acid)(PLLA).Given the excellent biocompatibility of PLCL materials,the US FDA has approved their use in clinical applications.PLCL stents can be used to treat diseases such as tracheal stenosis and tracheoesophageal fistula,and can also be applied in the construction of other tissue engineering stents,such as nerve conduitsand fat filling stents.The newly designed coronary stents were fabricated using a 3D printing technology with a rotating platform,coated with a paclitaxel coating and comprehensive in vitro research was conducted.It was the first to undergo tests in animals.Results showed the novel paclitaxel eluting PLCL stents had super-flexible structure,thinner round cross-sectional struts,a faster degradation profile and satisfactory hemocompatibility.With a paclitaxel dose of 0.57μg/mm^(2),the drug eluting stents showed very low degree of stenosis within 6 months of implantation in a porcine model.Overall,the results showed that the novel 3D printed PLCL drug eluting stent is a very promising candidate for next generation bioresorbable coronary stent.
